<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <a href="http://localhost:3000/submit">跳转</a>
    <form action="http://127.0.0.1:3000/submit" method="post">
        <label for="username">
            <input type="text" id="username" name="username">
        </label>
        <label for="password">
            <input type="text" id="password" name="password">
        </label>
        <button>提交</button>
    </form>
</body>
</html>